/*
 *
 * Copyright (c) 2013-2021, Alibaba Group Holding Limited;
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package com.aliyun.polardbx.binlog.canal;

import com.aliyun.polardbx.binlog.error.PolardbxException;

public class AutoSequence {

    private long maxValue;
    private int sequence;

    public void setMaxValue(long newMaxValue) {
        if (newMaxValue > maxValue) {
            maxValue = newMaxValue;
            sequence = 0;
        }
    }

    public int nextSeq(long value) {
        if (value != maxValue) {
            throw new PolardbxException("current value not equal max value" + value + ", " + maxValue);
        }
        return ++sequence;
    }

    public long maxValue() {
        return maxValue;
    }

}
